Fuselage Wiring Harness, Part 3 (Final)

After the relay deck was successfully installed and tested, I discovered that the Dynon Skyview avionics system features a speed control.  Since I had opted to move the pitch trim from the instrument panel's rocker switch and associated features with Skyview, I learned that I needed to provide an external speed control.  The pitch trim servo, without any speed control, will run stop-to-stop in 12 seconds.  Vans prescribes 25-30 seconds for full travel of the servo.

After a friendly consult with one of the electrical experts on Vansairforce, Joe Gores, I learned that I was a mere $15 Ebay transaction away from purchasing a ready-made external pulse width modulated (PWM) speed control.  Connections involved 12 volts power, an airframe ground and then the ground from the relay deck and its speed control input wire.  The little controller works like a charm.  It even provides a knob that you adjust to attain the desired servo motor speed, so I am set!  Thanks Joe!!!

Here are a few shots of the PWM speed control and its relative location.  It has been installed with some outdoor permanent double backed tape.

After the speed controller was installed and tested, it was basically time to finish bundling the 2 main wire harnesses (fuselage and options).  Below is a picture of the wiring shield and the wiring bundle hangar that constrains the wiring harnesses as they run beneath and below the rudder pedal torque tubes.

 One of the ongoing aggravations I have experienced with the wiring tasks has involved the use of micro-fit connectors.  At this point I am completely abandoning their use in my airplane.  Even with the use of a fairly nice ratcheting crimper, I have struggled to get a consistent, quality crimp on the tiny little buggers.  What's more, I have also had inconsistent results with their remaining securely captured in the Molex connector body.  In light of this I have gone away from them entirely and moved to conventional fast-on connectors and I am much happier with the consistent and predictable results.  The picture below shows the conversion to the fast-on connectors.

You will also note that this shot is from the baggage bulkhead where I have created a connection to the pitch trim wires so that I can complete the wiring tasks without the requirement of attaching the tailcone.

Since the Viking engine uses a different fuel pump assembly than the Rotax, it was not feasible to use the Adele clamp on the fuel flow sender to support the wiring harness. In light of that I made an internally threaded aluminum tube as a standoff to attach an Adele clamp which could support the wiring harness as shown below.

Wiring harnesses proceeds aft through the fuel filter/fuel shutoff valve bay.

Another shot of the wiring harness as it proceeds through seat bottom rib area.